package com.kanshu.ksgb.fastread.doudou.common.view;

import android.animation.ObjectAnimator;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.ViewGroup;
import android.view.animation.DecelerateInterpolator;
import android.widget.ImageView;

/**
 * Created by daniel on 17-12-14.
 */

public class FloatButton extends ImageView{

    private int parentHeight;
    private int parentWidth;

    public FloatButton(Context context) {
        super(context);
    }

    public FloatButton(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public FloatButton(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

    }


    private int lastX;
    private int lastY;

    private boolean isDrag;

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        int rawX = (int) event.getRawX();
        int rawY = (int) event.getRawY();
        switch (event.getAction() & MotionEvent.ACTION_MASK) {
            case MotionEvent.ACTION_DOWN:
                setPressed(true);
                isDrag=false;
                getParent().requestDisallowInterceptTouchEvent(true);
                lastX=rawX;
                lastY=rawY;
                ViewGroup parent;
                if(getParent()!=null){
                    parent= (ViewGroup) getParent();
                    parentHeight=parent.getHeight();
                    parentWidth=parent.getWidth();
                }
                return true;
                //break;
            case MotionEvent.ACTION_MOVE:
                if(parentHeight<=0||parentWidth==0){
                    isDrag=false;
                    break;
                }else {
                    isDrag=true;
                }
                int dx=rawX-lastX;
                int dy=rawY-lastY;
                //这里修复一些华为手机无法触发点击事件
                int distance= (int) Math.sqrt(dx*dx+dy*dy);
                if(distance < 15){
                    isDrag=false;
                    break;
                }
                float x=getX()+dx;
                float y=getY()+dy;
                //检测是否到达边缘 左上右下
                x=x<0?0:x>parentWidth-getWidth()?parentWidth-getWidth():x;
                y=getY()<0?0:getY()+getHeight()>parentHeight?parentHeight-getHeight():y;
                setX(x);
                setY(y);
                lastX=rawX;
                lastY=rawY;
                Log.i("aa","isDrag="+isDrag+"getX="+getX()+";getY="+getY()+";parentWidth="+parentWidth);
                break;
            case MotionEvent.ACTION_UP:
                if(!isNotDrag()){
                    //恢复按压效果
                    setPressed(false);
                    //Log.i("getX="+getX()+"；screenWidthHalf="+screenWidthHalf);
                    if(rawX>=parentWidth/2){
                        //靠右吸附
                        animate().setInterpolator(new DecelerateInterpolator())
                                .setDuration(500)
                                .xBy(parentWidth-getWidth()-getX())
                                .start();
                    }else {
                        //靠左吸附
                        ObjectAnimator oa= ObjectAnimator.ofFloat(this,"x",getX(),0);
                        oa.setInterpolator(new DecelerateInterpolator());
                        oa.setDuration(500);
                        oa.start();
                    }
                }
                break;
        }
        //如果是拖拽则消s耗事件，否则正常传递即可。
        return !isNotDrag() || super.onTouchEvent(event);
    }

    private boolean isNotDrag(){
        return !isDrag&&(getX()==0
                ||(getX()==parentWidth-getWidth()));
    }
}
